Sulfonic-functionalized heteropolyacid-silica nanoparticles for high temperature operation of a direct methanol fuel cell

Hyun Jong Kim, Yong Gun Shul, Haksoo Han

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Sulfonic-functionalized heteropolyacid-SiO2 nanoparticles were synthesized by grafting and oxidizing of a thiol-silane compound onto the heteropolyacid-SiO2 nanoparticle surface. The surface functionalization was confirmed by solid-state NMR spectroscopy. The composite membrane containing the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was prepared by blending with Nafion® ionomer. TG-DTA analysis showed that the composite membrane was thermally stable up to 290 °C. The DMFC performance of the composite membrane increased the operating temperature from 80 to 200 °C. The function of the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was to provide a proton carrier and act as a water reservoir in the composite membrane at elevated temperature. The power density was 33 mW cm-2 at 80 °C, 39 mW cm-2 at 160 °C and 44 mW cm-2 at 200 °C, respectively.

Original languageEnglish
Pages (from-to)137-142
Number of pages6
JournalJournal of Power Sources
Volume158
Issue number1
DOIs
Publication statusPublished - 2006 Jul 14

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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